Exhaust Gas Condensate Corrosion Test on Low Pressure Cooling System of Aluminum Brazed EGR, ACAC and WCAC 2012-01-1947
New emission regulations require innovation in the engine intake air loop. To satisfy these requirements, new architectures of cooling systems are in the process of development. These systems use valves to regulate the exhaust gas pressure and distribution in the intake cooling loop and ultimately combustion chambers. Since lower pressure is involved in the Exhaust Gas Recirculation (EGR), Water Charge Air Cooler (WCAC) or Air Charge Air Cooler (ACAC), the condensation of exhaust gas takes place and very acidic solutions are generated.
In the absence of such new architecture of cooling system in service and in order to evaluate the corrosion risk that the acidic solutions from exhaust gases condensate could create in the EGR system, several tests have been proposed as representative for simulation of service conditions.
A new bench test was developed to provide an evaluation of the corrosion resistance using the pressure, flow rate, temperature and composition of the condensate corresponding to the identified parameters of service. Descriptions and discussion of the tests protocol and results are included in the presentation.
The aim of this paper is to present the functionality of the test bench, the test results and perspectives to improve the corrosion resistance of the heat exchanger components.